EP0294686A2 - Process for the preparation of diaryliminocarbonates - Google Patents
Process for the preparation of diaryliminocarbonates Download PDFInfo
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- EP0294686A2 EP0294686A2 EP88108662A EP88108662A EP0294686A2 EP 0294686 A2 EP0294686 A2 EP 0294686A2 EP 88108662 A EP88108662 A EP 88108662A EP 88108662 A EP88108662 A EP 88108662A EP 0294686 A2 EP0294686 A2 EP 0294686A2
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- UBJFVZNLGWUAMA-UHFFFAOYSA-N N=C(Oc1ccccc1)OC1=CCCC=C1 Chemical compound N=C(Oc1ccccc1)OC1=CCCC=C1 UBJFVZNLGWUAMA-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C269/00—Preparation of derivatives of carbamic acid, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
- C07C269/06—Preparation of derivatives of carbamic acid, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups by reactions not involving the formation of carbamate groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C271/00—Derivatives of carbamic acids, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
- C07C271/68—Compounds containing any of the groups
Definitions
- the present invention relates to processes for the preparation of iminocarbonic acid diaryl esters and new iminocarbonic acid diaryl esters.
- N-substituted iminocarbonic acid diaryl esters which are of interest as valuable starting materials or intermediates for the preparation of dyes
- pharmaceuticals and crop protection agents are or can also be used directly as crop protection agents (see, for example, JP OS 9846/1975 or Chem. Abstracts 83 , 127548 d) by reacting isocyanide dihalides with phenols or phenolates.
- a disadvantage of this method is that the isocyanide dihalides used as starting materials can only be prepared from amines by detours.
- N-alkyl-substituted imino carbonic acid diphenyl esters can be prepared by reacting phenols with dialkylaminotrichloromethane.
- dialkylaminotrichloromethane compounds which are also to be regarded as imonium compounds, are only readily accessible if the alkyl radicals on the nitrogen are not very sterically demanding. The reaction is therefore preferably carried out using dimethylaminotrichloromethane.
- the invention was based on the object of finding a simpler and more economical process by which a large number of differently substituted diaryl iminocarbons are accessible.
- Compounds with a hitherto unknown substitution pattern should be made available by a process which allows the substituents on the nitrogen and on the phenoxy radicals to be varied as desired.
- a process for the preparation of iminocarbonic acid diaryl esters of the general formula I in the R1 represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical
- Y and Z are the same or different and represent an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen
- m and n represent an integer from 1 to 5, where, if m and n are greater than 1, the radicals Y and Z are identical or different, found, which is characterized in that diphenyl iminocarbonate II with a substituted phenol III at temperatures of 50 to 250 ° C to iminocarbonic acid diaryl esters IV and reacting the compounds IV after their isolation or in situ with a phenol substituted by Z or Y to give the end products I.
- diaryl iminocarbonic acid of the formula IV in the R1 represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical
- Z represents an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen
- n stands for an integer from 1 to 5, advantageously obtained when diphenyl iminocarbonate II with a substituted phenol III at temperatures of 50 to 150 ° C, using 1 to 2 mol III per mol II and then isolating the iminocarbonic acid ester IV in a manner known per se.
- a process for the preparation of the iminocarbonic acid diphenyl esters of the general formula II used as starting materials in which R1 represents an alkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical, which is characterized in that dichlorodiphenoximethane with a primary amine R1NH2 in an inert solvent in the presence of a base and optionally in the presence of a catalytic amount of N, N-dialkylaminopyridine and the iminocarbonic acid diphenyl ester isolated in a conventional manner.
- imino carbonic acid diaryl esters I, II or IV are obtained in which the substituent on nitrogen R 1 for an alkyl group, for example having 1 to 20, in particular 1 to 10, carbon atoms, is an aminoalkyl group of the structure in the R2 and R3 represents a C1- to C8-, in particular C1- to C4-alkyl group or R2 and R3 are connected to one another and together with the nitrogen a 5-7-membered ring, in particular a 5- or 6-ring, which is yet another heteroatom , such as sulfur, nitrogen or oxygen, and in which the index p represents the numbers 1 to 8, preferably 1 to 4.
- R2 and R3 can also carry inert substituents, for example C1-C4-alkoxy or C1-C4-alkyl radicals.
- R1 represents heterocyclic radicals having 5 to 8, in particular 5 and 6, ring members, in which preferably 1 or 2 heteroatoms such as nitrogen, sulfur or oxygen are present, or heterocyclic radicals having 1 or 2 of the heteroatoms mentioned and 5 or 6 ring members, one of which Benzene ring may be condensed.
- R 1 can also be a heterocyclic, aromatic radical having 5 or 6 ring members and 1 or 2 of the heteroatoms mentioned, it also being possible for a benzene ring to be fused on.
- substituents R 1 on nitrogen are examples of substituents R 1 on nitrogen: methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, hexyl or octyl; N, N-dimethylaminomethyl, N, N-diethylaminomethyl, N, N-dimethylaminoethyl, N, N-dimethylaminopropyl, N, N-dimethylaminobutyl, 3-N-pyrrolidylpropyl, 4-N-morpholinylbutyl, 3-N-morpholinylpropyl, 3-N-piperidylpropyl; Cyclopropyl, cyclopentyl, cyclohexyl or cyclooctyl; Benzyl, phenylethyl, phenyl, phenyl substituted by fluorine, chlorine, bromine, methoxy, ethoxy, methyl, eth
- the phenyl substituents Z and Y are identical or different and represent an alkyl group with 1 to 9, in particular 1 to 4, carbon atoms, e.g. a methyl, ethyl, propyl, isopropyl, butyl or tert-butyl group, a C1-C4 alkoxy group such as methoxy or tert-butoxy, one substituted by halogen, e.g. chlorine, bromine or fluorine substituted alkyl group of 1 to 3 carbon atoms e.g.
- halogen e.g. chlorine, bromine or fluorine substituted alkyl group of 1 to 3 carbon atoms e.g.
- Y and Z are functional Groups such as nitro or cyano groups and for halogen, especially chlorine or bromine.
- the O-phenyl radical preferably bears 1 to 3, in particular 1 or 2, substituents Z or Y.
- the reaction of the diphenyl iminocarbonic acid with the phenol III to I is carried out in such a way that at least equimolar amounts, preferably an excess of III, based on the starting material II, are selected and the temperature is set at 50 to 250.degree. If you want to isolate the intermediate IV and then react it with further phenol to I, which can be advantageous if you want to produce products with different substituents Y and Z, you will equimolar amounts of III or a small excess, e.g. Use 1 to 2, in particular 1 to 1.5 mol III per mol II and the lowest possible reaction temperature, e.g.
- the reaction with a phenol substituted by Y increase the reaction temperature up to 250 ° C, advantageously 100 to 250 ° C.
- the amount of the phenol substituted by Y can be 1 to 3 mol, in particular 1 to 2 mol, per mol of the intermediate IV.
- the phenyl groups can be exchanged in the presence or absence of solvents. Suitable inert solvents are, for example, high-boiling hydrocarbons, halogenated hydrocarbons such as chlorobenzene, bromobenzene or dichlorobenzene or glycol ether.
- imino carbonic acid diaryl esters I are prepared with identical O-aryl radicals.
- isolation of intermediate IV is generally of no benefit.
- An excess of the phenolic reactant III, for example 2.1 to 20, in particular 2.5 to 10, mol per mol of II can preferably be used and the reaction can be carried out in the absence of a solvent.
- the reaction temperature is kept so high that the phenol exchange takes place completely. In general, temperatures of 50 to 250 ° C, in particular 70 to 200, preferably 80 to 170 ° C are sufficient. It is also possible to choose different temperature ranges and the implementation first start at a lower temperature of approx. 50 to 100 ° C and then increase the temperature to approx. 100 to 200 or 150 to 250 ° C.
- the substituted phenol used in excess can advantageously be recovered and reused for further reactions, e.g. separated from the reaction mixture by distillation or the reaction mixture worked up in aqueous form by using an inert organic solvent, e.g. add an ether or aliphatic hydrocarbon and extract the phenol with water, to which optionally a base such as an alkali carbonate is added.
- an inert organic solvent e.g. add an ether or aliphatic hydrocarbon and extract the phenol with water, to which optionally a base such as an alkali carbonate is added.
- the phenol released during the reaction can also be separated off in a manner known per se, e.g. by carrying out the reaction not under normal pressure but under a slight negative pressure.
- the isolation and purification of the iminocarbonic acid diaryl esters I and IV from the reaction mixture can be carried out in a manner known per se, e.g. by distillative removal of the more volatile components and, if necessary, recrystallization of the products, so that further explanations are unnecessary.
- the iminocarbonic acid diphenyl esters used as starting materials for the phenol exchange reaction described above are obtained according to the invention by reacting dichlorodiphenoximethane, for example as described in J. Heterocycl. Chem. 19 , 1205 (1982), can be obtained with a primary amine R1NH2 in the presence of a base according to the following reaction equation:
- the reaction takes place in the presence of a base which is suitable for binding the hydrogen chloride formed.
- a base which is suitable for binding the hydrogen chloride formed.
- tertiary amines may be mentioned as bases, trimethylamine, triethylamine, tributylamine or pyridine being particularly advantageous.
- the amount of base is not particularly critical, preferably 2 to 2.5 moles per mole of dichlorodiphenoxime methane can be used. Higher quantities are possible, but have no advantages.
- N, N-dialkylaminopyridine e.g. Add about 10 ⁇ 3 to 10 ⁇ 2 mol per mole of dichlorodiphenoximethane.
- Dialkylaminopyridines are e.g. 4-dimethylamino, 3-diethylamino or 4-dibutylaminopyridine.
- Suitable solvents are e.g. aliphatic or cycloaliphatic hydrocarbons such as pentane, hexane or cyclohexane, ethers such as diethyl ether, tetrahydrofuran, dioxane or halogenated aliphatic or cycloaliphatic hydrocarbons such as methylene chloride or chloroform and aromatics such as benzene or toluene.
- the amount of solvent is generally 0.5 to 1 l per mole of dichlorodiphenoxime methane.
- the reaction temperature can be varied very widely. So temperatures from 0 to 150, in particular 10 to 100 ° C are possible.
- the reaction is preferably carried out at temperatures from 0 to 25 ° C.
- reaction mixture can be worked up in a conventional manner, e.g. by filtering off the ammonium salt formed and separating the solvent.
- the remaining solid products are generally so pure that a subsequent recrystallization is unnecessary.
- Particularly interesting compounds for further use are diphenyl imino carbons of formula II, in the R1 a tert-alkyl group, an aminoalkyl group, a cycloalkyl radical, a heterocyclic radical with 5 to 8 ring members and 1 or 2 heteroatoms, a heteroaromatic radical with 1 or 2 heteroatoms or phenyl, substituted by C1-C4alkoxy-, haloalkyl -, Acylamino- or methyleneimino groups and Iminokohlenklastediarylester of formula V.
- R1 has the meaning given in Claim 10
- Z represents halogen, C1-C4-alkyl, C1-C4-alkoxy or phenyl
- n represents the number 1 or 2.
- Tertiary alkyl radicals are, for example, those having 4 to 10, in particular 4 to 8, carbon atoms, such as tert-butyl or tert-pentyl.
- Aminoalkyl groups are those of the structure defined above e.g.
- Cycloalkyl radicals are C5 to C8 cycloalkyl radicals, in particular cyclopentyl or cyclohexyl.
- Heterocyclic radicals or heteroaromatic radicals are the radicals defined above, in particular those with 5 or 6 ring members and 1 or 2 heteroatoms such as sulfur, oxygen or nitrogen, to which a benzene radical can be fused, for example piperidyl, 4- (2,2,6, 6-tetramethyl) piperidyl, pyridyl, dihydrofuranyl, furanyl, quinolinyl, pyrazinyl, pyrimidyl, pyrrolyl, benzofuranyl, indolyl, thiophenyl, pyrazolyl, imidazolyl or oxazolyl radicals.
- Substituents on the phenyl radical are, for example, C1 to C4 alkoxy, such as methoxy, ethoxy, propoxy, tert. Butoxy, haloalkyl, in particular with 1 to 4 carbon atoms and 1 to 3 halogen atoms, for example trifluoromethyl, dichloromethyl, dibromomethyl, 2-chloroethyl or 1,2,2-trichloroethyl.
- acylamino residues have the structure -NH- -R4, wherein R4 is a C1 to C4 alkyl group, the acetyl group being preferred.
- R5 is preferably phenoxy.
- the compounds according to the invention are important intermediates; 117, page 2579, 1984, Journal of Heterocyclic Chemistry 21 , 753-757, 1984 or described in US Pat. No. 4,285,878 to form isoureas.
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Abstract
Description
Die vorliegende Erfindung betrifft Verfahren zur Herstellung von Iminokohlensäurediarylestern sowie neue Iminokohlensäurediarylester.The present invention relates to processes for the preparation of iminocarbonic acid diaryl esters and new iminocarbonic acid diaryl esters.
Gemäß dem Stand der Technik, z.B. Houben-Weyl, Methoden der Organischen Chemie, Bd. E4, Seite 544 ff (1983) können N-substituierte Iminokohlensäurediarylester, die als wertvolle Ausgangs- bzw. Zwischenprodukte zur Herstellung von Farbstoffen, Pharmaka und Pflanzenschutzmitteln von Interesse sind oder auch direkt als Pflanzenschutzmittel Verwendung finden (siehe z.B. JP OS 9846/1975 oder Chem. Abstracts 83, 127548 d) durch Umsetzung von Isocyaniddihalogeniden mit Phenolen bzw. Phenolaten erhalten werden.According to the prior art, for example Houben-Weyl, Methods of Organic Chemistry, vol. E4, page 544 ff (1983), N-substituted iminocarbonic acid diaryl esters, which are of interest as valuable starting materials or intermediates for the preparation of dyes, pharmaceuticals and crop protection agents are or can also be used directly as crop protection agents (see, for example, JP OS 9846/1975 or Chem. Abstracts 83 , 127548 d) by reacting isocyanide dihalides with phenols or phenolates.
Ein Nachteil dieser Methode besteht darin, daß die als Edukte verwendeten Isocyaniddihalogenide nur über Umwege aus Aminen herstellbar sind.A disadvantage of this method is that the isocyanide dihalides used as starting materials can only be prepared from amines by detours.
Es ist ferner aus J. Heterocycl. Chem. 19, 1205 (1982) bekannt, daß Dichloridiphenoximethan mit Cyanamid zu N-Cyano-iminokohlensäurediphenylester reagiert. N-alkylsubstituierte Iminokohlensäurediphenylester können gemäß der DE-OS 20 33 278 durch Umsetzung von Phenolen mit Dialkylaminotrichlormethan hergestellt werden. Die Dialkylaminotrichlormethanverbindungen, die auch als Imoniumverbindungen aufzufassen sind, sind jedoch nur dann gut zugänglich, wenn die Alkylreste am Stickstoff sterisch nicht sehr anspruchsvoll sind. Vorzugsweise wird die Umsetzung daher mit Dimethylaminotrichlormethan durchgeführt.It is also from J. Heterocycl. Chem. 19, 1205 (1982) discloses that dichloridiphenoxime methane reacts with cyanamide to give N-cyano-iminocarbonic acid diphenyl ester. According to DE-OS 20 33 278, N-alkyl-substituted imino carbonic acid diphenyl esters can be prepared by reacting phenols with dialkylaminotrichloromethane. However, the dialkylaminotrichloromethane compounds, which are also to be regarded as imonium compounds, are only readily accessible if the alkyl radicals on the nitrogen are not very sterically demanding. The reaction is therefore preferably carried out using dimethylaminotrichloromethane.
Der Erfindung lag die Aufgabe zugrunde, ein einfacheres und wirtschaftliches Verfahren zu finden, nach dem eine Vielzahl verschieden substituierter Iminokohlensäurediarylester zugänglich sind. Durch ein Verfahren, das es gestattet, die Substituenten am Stickstoff und an den Phenoxiresten beliebig zu variieren, sollten Verbindungen mit bislang unbekanntem Substitutionsmuster zur Verfügung gestellt werden.The invention was based on the object of finding a simpler and more economical process by which a large number of differently substituted diaryl iminocarbons are accessible. Compounds with a hitherto unknown substitution pattern should be made available by a process which allows the substituents on the nitrogen and on the phenoxy radicals to be varied as desired.
Demgemäß wurde ein Verfahren zur Herstellung von Iminokohlensäurediarylestern der allgemeinen Formel I
R¹ eine Alkyl-, Aminoalkyl-, Cycloalkyl-, Aralkyl-, Arylgruppe oder einen heterocyclischen oder heteroaromatischen Rest darstellt,
Y und Z gleich oder verschieden sind und eine Alkyl-, Alkoxy-, Halogenalkyl-, Aryl-, Cyano-, Nitrogruppe oder Halogen bedeuten,
m und n für eine ganze Zahl von 1 bis 5 stehen, wobei, wenn m und n größer 1 sind, die Reste Y bzw. Z gleich oder verschieden sind,
gefunden, das dadurch gekennzeichnet ist, daß man Iminokohlensäurediphenylester II
R¹ represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical,
Y and Z are the same or different and represent an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen,
m and n represent an integer from 1 to 5, where, if m and n are greater than 1, the radicals Y and Z are identical or different,
found, which is characterized in that diphenyl iminocarbonate II
Weiterhin wurde gefunden, daß man Iminokohlensäurediarylester der Formel IV
R¹ eine Alkyl-, Aminoalkyl-, Cycloalkyl-, Aralkyl-, Arylgruppe oder einen heterocyclischen oder heteroaromatischen Rest darstellt,
Z eine Alkyl-, Alkoxy-, Halogenalkyl-, Aryl-, Cyano-, Nitrogruppe oder Halogen bedeutet und
n für eine ganze Zahl von 1 bis 5 steht, vorteilhaft erhält, wenn man Iminokohlensäurediphenylester II
R¹ represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical,
Z represents an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen and
n stands for an integer from 1 to 5, advantageously obtained when diphenyl iminocarbonate II
Weiterhin wurde ein Verfahren zur Herstellung der als Ausgangsstoffe verwendeten Iminokohlensäurediphenylester der allgemeinen Formel II
Nach den erfindungsgemäßen Verfahren werden Iminokohlensäurediarylester I, II oder IV erhalten, in denen der Substituent am Stickstoff R¹ für eine Alkylgruppe, z.B. mit 1 bis 20, insbesondere 1 bis 10 Kohlenstoffatomen, eine Aminoalkylgruppe der Struktur
R² und R³ eine C₁- bis C₈-, insbesondere C₁- bis C₄-Alkylgruppe darstellt oder R² und R³ miteinander verbunden sind und zusammen mit dem Stickstoff einen 5-7gliedrigen Ring, insbesondere einen 5- oder 6-Ring, der noch ein weiteres Heteroatom, wie Schwefel, Stickstoff oder Sauerstoff enthalten kann, bilden und in der der Index p für die Zahlen 1 bis 8, vorzugsweise 1 bis 4, steht. Die Reste R² und R³ können auch inerte Substituenten, z.B. C₁-C₄-Alkoxy- oder C₁-C₄-Alkylreste tragen. Weiterhin steht R¹ für eine Cycloalkylgruppe mit 3 bis 8, insbesondere 5 bis 7 Kohlenstoffatomen, eine Aralkylgruppe vorteilhaft mit 7 bis 12 Kohlenstoffatomen, eine Arylgruppe, z.B. eine Phenylgruppe, die unter den Reaktionsbedingungen inerte Substituenten tragen kann, wie Halogenatome, z.B. Fluor, Chlor oder Brom, C₁- bis C₄-Alkoxy- oder Alkylreste, Halogenalkylreste, insbesondere mit 1 bis 4 Kohlenstoffatomen und 1 bis 3 Halogenatomen, Nitro- oder Cyanogruppen sowie Methyleniminogruppen, z.B. diphenoxysubstituierte Methyleniminogruppen -N=C(OC₆H₅)₂ oder Acylaminogruppen
-NH--R⁴ ,
worin R⁴ eine C₁- bis C₄-Alkylgruppe bedeutet. Weiterhin steht R¹ für heterocyclisches Reste mit 5 bis 8, insbesondere 5 und 6 Ringgliedern, in denen vorzugsweise 1 oder 2 Heteroatome wie Stickstoff, Schwefel oder Sauerstoff vorkommen oder für heterocyclische Reste mit 1 oder 2 der genannten Heteroatome und 5 oder 6 Ringgliedern, denen ein Benzolring ankondensiert sein kann. Auch kann R¹ ein heterocyclischer, aromatischer Rest mit 5 oder 6 Ringgliedern und 1 oder 2 der genannten Heteroatome sein, wobei ebenfalls ein Benzolring ankondensiert sein kann.According to the process of the invention, imino carbonic acid diaryl esters I, II or IV are obtained in which the substituent on nitrogen R 1 for an alkyl group, for example having 1 to 20, in particular 1 to 10, carbon atoms, is an aminoalkyl group of the structure
R² and R³ represents a C₁- to C₈-, in particular C₁- to C₄-alkyl group or R² and R³ are connected to one another and together with the nitrogen a 5-7-membered ring, in particular a 5- or 6-ring, which is yet another heteroatom , such as sulfur, nitrogen or oxygen, and in which the index p represents the numbers 1 to 8, preferably 1 to 4. The radicals R² and R³ can also carry inert substituents, for example C₁-C₄-alkoxy or C₁-C₄-alkyl radicals. Furthermore, R1 represents a cycloalkyl group having 3 to 8, in particular 5 to 7, carbon atoms, an aralkyl group advantageously having 7 to 12 carbon atoms, an aryl group, for example a phenyl group, which can carry substituents which are inert under the reaction conditions, such as halogen atoms, for example fluorine, chlorine or Bromine, C₁ to C₄ alkoxy or alkyl radicals, haloalkyl radicals, in particular with 1 to 4 carbon atoms and 1 to 3 halogen atoms, nitro or cyano groups and methyleneimino groups, for example diphenoxy-substituted methyleneimino groups -N = C (OC₆H₅) ₂ or acylamino groups
-NH- -R⁴,
wherein R⁴ represents a C₁ to C₄ alkyl group. Furthermore, R¹ represents heterocyclic radicals having 5 to 8, in particular 5 and 6, ring members, in which preferably 1 or 2 heteroatoms such as nitrogen, sulfur or oxygen are present, or heterocyclic radicals having 1 or 2 of the heteroatoms mentioned and 5 or 6 ring members, one of which Benzene ring may be condensed. R 1 can also be a heterocyclic, aromatic radical having 5 or 6 ring members and 1 or 2 of the heteroatoms mentioned, it also being possible for a benzene ring to be fused on.
Als Substituenten R¹ am Stickstoff seien beispielhaft folgende Reste aufgeführt: Methyl, Ethyl, Propyl, Isopropyl, Butyl, tert.-Butyl, Hexyl oder Octyl; N,N-Dimethylaminomethyl, N,N-Diethylaminomethyl, N,N-Dimethylaminoethyl, N,N-Dimethylaminopropyl, N,N-Dimethylaminobutyl, 3-N-Pyrrolidylpropyl, 4-N-Morpholinyl-butyl, 3-N-Morpholinylpropyl, 3-N-Piperidylpropyl; Cyclopropyl, Cyclopentyl, Cyclohexyl oder Cyclooctyl; Benzyl-, Phenylethyl-, Phenyl-, Phenyl substituiert durch Fluor, Chlor, Brom, Methoxy, Ethoxy, Methyl, Ethyl, Propyl, Butyl, tert.-Butyl, Dichlormethyl, Trifluormethyl, 2-Chlorethyl, Nitro, Cyano, Diphenoxymethylenimino oder Acetylamino sowie als heterocyclische, bzw. heteroaromatische Reste: Piperidyl-, Pyridyl-, Dihydrofuranyl-, Furanyl-, Chinolinyl-, Pyrazinyl-, Pyrimidyl-, Pyrrolyl-, Benzofuranyl-, Indolyl-, Thiophenyl-, Pyrazolyl-, Imidazolyl-oder Oxazolylreste.The following radicals are examples of substituents R 1 on nitrogen: methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, hexyl or octyl; N, N-dimethylaminomethyl, N, N-diethylaminomethyl, N, N-dimethylaminoethyl, N, N-dimethylaminopropyl, N, N-dimethylaminobutyl, 3-N-pyrrolidylpropyl, 4-N-morpholinylbutyl, 3-N-morpholinylpropyl, 3-N-piperidylpropyl; Cyclopropyl, cyclopentyl, cyclohexyl or cyclooctyl; Benzyl, phenylethyl, phenyl, phenyl substituted by fluorine, chlorine, bromine, methoxy, ethoxy, methyl, ethyl, propyl, butyl, tert-butyl, dichloromethyl, trifluoromethyl, 2-chloroethyl, nitro, cyano, diphenoxymethyleneimino or acetylamino and as heterocyclic or heteroaromatic radicals: piperidyl, pyridyl, dihydrofuranyl, furanyl, quinolinyl, pyrazinyl, pyrimidyl, pyrrolyl, benzofuranyl, indolyl, thiophenyl, pyrazolyl, imidazolyl or oxazolyl radicals.
Die Phenylsubstituenten Z bzw. Y sind gleich oder verschieden und stellen eine Alkylgruppe mit 1 bis 9, insbesondere 1 bis 4 Kohlenstoffatomen, z.B. eine Methyl-, Ethyl-, Propyl-, Isopropyl-, Butyl- oder tert.-Butylgruppe, eine C₁-C₄-Alkoxygruppe, wie Methoxy- oder tert.-Butoxy, eine durch Halogen, z.B. durch Chlor, Brom oder Fluor substituierte Alkylgruppe mit 1 bis 3 Kohlenstoffatomen, z.B. eine Trifluormethyl-, Dichlormethyl- oder 2-Chlorethylgruppe, eine Arylgruppe, insbesondere Phenylgruppe, die durch inerte Gruppen, wie Halogen, C₁-C₄-Alkyl- oder Alkoxy- oder Nitrogruppen substituiert sein kann, dar. Weiterhin stehen Y bzw. Z für funktionelle Gruppen, wie Nitro- oder Cyanogruppen sowie für Halogen, insbesondere Chlor oder Brom. Vorzugsweise trägt der O-Phenylrest 1 bis 3, insbesondere 1 oder 2 Substituenten Z bzw. Y. Besonders vorteilhaft können nach dem erfindungsgemäßen Verfahren Verbindungen der Formel I, in denen die Bedeutung der Substituenten Y and Z gleich ist, hergestellt werden.The phenyl substituents Z and Y are identical or different and represent an alkyl group with 1 to 9, in particular 1 to 4, carbon atoms, e.g. a methyl, ethyl, propyl, isopropyl, butyl or tert-butyl group, a C₁-C₄ alkoxy group such as methoxy or tert-butoxy, one substituted by halogen, e.g. chlorine, bromine or fluorine substituted alkyl group of 1 to 3 carbon atoms e.g. a trifluoromethyl, dichloromethyl or 2-chloroethyl group, an aryl group, in particular phenyl group, which can be substituted by inert groups such as halogen, C₁-C₄-alkyl or alkoxy or nitro groups. Furthermore, Y and Z are functional Groups such as nitro or cyano groups and for halogen, especially chlorine or bromine. The O-phenyl radical preferably bears 1 to 3, in particular 1 or 2, substituents Z or Y. Compounds of the formula I in which the meaning of the substituents Y and Z are identical can be prepared particularly advantageously by the process according to the invention.
Die erfindungsgemäße Umsetzung des Iminokohlensäurediphenylesters mit dem Phenol III zu I erfolgt in der Weise, daß man mindestens äquimolare Mengen, vorzugsweise einen Überschuß an III, bezogen auf den Ausgangsstoff II, wählt und die Temperatur auf 50 bis 250°C einstellt. Will man das Zwischenprodukt IV isolieren und anschließend mit weiterem Phenol zu I umsetzen, was vorteilhaft sein kann, wenn man Produkte mit unterschiedlichen Substituenten Y und Z herstellen will, so wird man äquimolare Mengen an III oder einen nur geringen Überschuß, z.B. 1 bis 2, insbesondere 1 bis 1,5 mol III pro Mol II verwenden und eine möglichst geringe Reaktionstemperatur, z.B. eine Temperatur von 50 bis 150°C wählen und erst im zweiten Reaktionsschritt, der Umsetzung mit einem durch Y substituierten Phenol, die Reaktionstempertur auf bis zu 250°C, vorteilhaft 100 bis 250°C, erhöhen. Die Menge des durch Y substituierten Phenols kann 1 bis 3 mol, insbesondere 1 bis 2 mol pro Mol des Zwischenprodukts IV betragen. Der Austausch der Phenylgruppen kann in Gegenwart oder Abwesenheit von Lösungsmitteln erfolgen. Geeignete inerte Lösungsmittel sind beispielsweise hochsiedende Kohlenwasserstoffe, halogenierte Kohlenwasserstoffe, wie Chlorbenzol, Brombenzol oder Dichlorbenzol oder Glykolether.The reaction of the diphenyl iminocarbonic acid with the phenol III to I is carried out in such a way that at least equimolar amounts, preferably an excess of III, based on the starting material II, are selected and the temperature is set at 50 to 250.degree. If you want to isolate the intermediate IV and then react it with further phenol to I, which can be advantageous if you want to produce products with different substituents Y and Z, you will equimolar amounts of III or a small excess, e.g. Use 1 to 2, in particular 1 to 1.5 mol III per mol II and the lowest possible reaction temperature, e.g. select a temperature of 50 to 150 ° C and only in the second reaction step, the reaction with a phenol substituted by Y, increase the reaction temperature up to 250 ° C, advantageously 100 to 250 ° C. The amount of the phenol substituted by Y can be 1 to 3 mol, in particular 1 to 2 mol, per mol of the intermediate IV. The phenyl groups can be exchanged in the presence or absence of solvents. Suitable inert solvents are, for example, high-boiling hydrocarbons, halogenated hydrocarbons such as chlorobenzene, bromobenzene or dichlorobenzene or glycol ether.
Nach einer bevorzugten Ausführungsform des Verfahrens werden Iminokohlensäurediarylester I mit identischen O-Arylresten hergestellt. In diesem Fall bringt eine Isolierung des Zwischenprodukts IV im allgemeinen keine Vorteile. Vorzugsweise kann man einen Überschuß des phenolischen Reaktanten III, z.B. 2,1 bis 20, insbesondere 2,5 bis 10 mol pro Mol II, verwenden und die Reaktion in Abwesenheit eines Lösungsmittels durchführen. Die Reaktionstemperatur wird so hoch gehalten, daß der Phenolaustausch vollständig stattfindet. Im allgemeinen sind Temperaturen von 50 bis 250°C, insbesondere 70 bis 200, vorzugsweise 80 bis 170°C ausreichend. Es ist auch möglich, verschiedene Temperaturbereiche zu wählen und die Umsetzung zunächst bei niedrigerer Temperatur von ca. 50 bis 100°C zu beginnen und dann die Temperatur auf ca. 100 bis 200 oder 150 bis 250°C zu erhöhen.According to a preferred embodiment of the process, imino carbonic acid diaryl esters I are prepared with identical O-aryl radicals. In this case, isolation of intermediate IV is generally of no benefit. An excess of the phenolic reactant III, for example 2.1 to 20, in particular 2.5 to 10, mol per mol of II can preferably be used and the reaction can be carried out in the absence of a solvent. The reaction temperature is kept so high that the phenol exchange takes place completely. In general, temperatures of 50 to 250 ° C, in particular 70 to 200, preferably 80 to 170 ° C are sufficient. It is also possible to choose different temperature ranges and the implementation first start at a lower temperature of approx. 50 to 100 ° C and then increase the temperature to approx. 100 to 200 or 150 to 250 ° C.
Das im Überschuß eingesetzte substituierte Phenol kann vorteilhaft zurückgewonnen und für weitere Umsetzungen wieder verwendet werden, indem man es z.B. destillativ aus dem Reaktionsgemisch abtrennt oder das Reaktionsgemisch wässrig aufarbeitet, indem man ein inertes organisches Lösungsmittel, z.B. einen Ether oder aliphatischen Kohlenwasserstoff hinzufügt und das Phenol mit Wasser, dem gegebenenfalls eine Base, wie ein Alkalicarbonat hinzugefügt wird, extrahiert.The substituted phenol used in excess can advantageously be recovered and reused for further reactions, e.g. separated from the reaction mixture by distillation or the reaction mixture worked up in aqueous form by using an inert organic solvent, e.g. add an ether or aliphatic hydrocarbon and extract the phenol with water, to which optionally a base such as an alkali carbonate is added.
Auch das bei der Umsetzung freigesetzte Phenol läßt sich in an sich bekannter Weise abtrennen, z.B. indem man die Reaktion nicht bei Normaldruck, sondern einem geringen Unterdruck durchführt.The phenol released during the reaction can also be separated off in a manner known per se, e.g. by carrying out the reaction not under normal pressure but under a slight negative pressure.
Die Isolierung und Reinigung der Iminokohlensäurediarylester I bzw. IV aus dem Umsetzungsgemisch kann in an sich bekannter Weise, z.B. durch destillative Abtrennung der flüchtigeren Komponenten und ggf. Umkristallisieren der Produkte erfolgen, so daß sich weitere Ausführungen hierzu erübrigen.The isolation and purification of the iminocarbonic acid diaryl esters I and IV from the reaction mixture can be carried out in a manner known per se, e.g. by distillative removal of the more volatile components and, if necessary, recrystallization of the products, so that further explanations are unnecessary.
Die als Ausgangsstoffe für die oben beschriebene Phenolaustauschreaktion verwendeten Iminokohlensäurediphenylester werden erfindungsgemäß durch Umsetzung von Dichlordiphenoximethan, das z.B. wie in J. Heterocycl. Chem. 19, 1205 (1982) beschrieben, erhalten werden kann, mit einem primären Amin R¹NH₂ in Gegenwart einer Base gemäß folgender Reaktionsgleichung hergestellt:
Pro Mol Dichlordiphenoximethan können vorteilhaft 1 bis 1,5, insbesondere 1 bis 1,2 mol des primären Amins verwendet werden. Bevorzugt werden äquimolare Mengen beider Reaktanten umgesetzt.1 to 1.5, in particular 1 to 1.2, mol of the primary amine can advantageously be used per mol of dichlorodiphenoxime methane. Equimolar amounts of both reactants are preferably reacted.
Die Reaktion erfolgt in Gegenwart einer Base, die geeignet ist, den entstehenden Chlorwasserstoff zu binden. Beispielsweise seien als Basen tertiäre Amine genannt, wobei Trimethylamin, Triethylamin, Tributylamin oder Pyridin besonders vorteilhaft sind. Die Menge der Base ist nicht besonders kritisch, vorzugsweise kann man 2 bis 2,5 mol pro Mol Dichlordiphenoximethan verwenden. Höhere Mengen sind möglich, bringen aber keine Vorteile.The reaction takes place in the presence of a base which is suitable for binding the hydrogen chloride formed. For example, tertiary amines may be mentioned as bases, trimethylamine, triethylamine, tributylamine or pyridine being particularly advantageous. The amount of base is not particularly critical, preferably 2 to 2.5 moles per mole of dichlorodiphenoxime methane can be used. Higher quantities are possible, but have no advantages.
Zur Beschleunigung der Umsetzung kann es häufig vorteilhaft sein, dem Umsetzungsgemisch katalytische Mengen an N,N-Dialkylaminopyridin, z.B. ca. 10⁻³ bis 10⁻² mol pro Mol Dichlordiphenoximethan zuzusetzen. Dialkylaminopyridine sind z.B. 4-Dimethylamino-, 3-Diethylamino- oder 4-Dibutylaminopyridin.To accelerate the reaction, it can often be advantageous to add catalytic amounts of N, N-dialkylaminopyridine, e.g. Add about 10⁻³ to 10⁻² mol per mole of dichlorodiphenoximethane. Dialkylaminopyridines are e.g. 4-dimethylamino, 3-diethylamino or 4-dibutylaminopyridine.
Die Umsetzung wird in Gegenwart eines inerten organischen Lösungsmittels durchgeführt. Geeignete Lösungsmittel sind z.B. aliphatische oder cycloaliphatische Kohlenwasserstoffe, wie Pentan, Hexan oder Cyclohexan, Ether, wie Diethylether, Tetrahydrofuran, Dioxan oder halogenierte aliphatische oder cycloaliphatische Kohlenwasserstoffe, wie Methylenchlorid oder Chloroform sowie Aromaten, wie Benzol oder Toluol. Die Lösungsmittelmenge beträgt im allgemeinen 0,5 bis 1 l pro Mol Dichlordiphenoximethan.The reaction is carried out in the presence of an inert organic solvent. Suitable solvents are e.g. aliphatic or cycloaliphatic hydrocarbons such as pentane, hexane or cyclohexane, ethers such as diethyl ether, tetrahydrofuran, dioxane or halogenated aliphatic or cycloaliphatic hydrocarbons such as methylene chloride or chloroform and aromatics such as benzene or toluene. The amount of solvent is generally 0.5 to 1 l per mole of dichlorodiphenoxime methane.
Die Reaktionstemperatur kann sehr stark variiert werden. So sind Temperaturen von 0 bis 150, insbesondere 10 bis 100°C möglich. Bevorzugt wird man die Reaktion bei Temperaturen von 0 bis 25°C durchführen.The reaction temperature can be varied very widely. So temperatures from 0 to 150, in particular 10 to 100 ° C are possible. The reaction is preferably carried out at temperatures from 0 to 25 ° C.
Nach erfolgter Umsetzung kann das Reaktionsgemisch in an sich üblicher Weise aufgearbeitet werden, z.B. indem man das gebildete Ammoniumsalz abfiltriert und das Lösungsmittel abtrennt. Die verbleibenden festen Produkte sind im allgemeinen so rein, daß sich ein anschließendes Umkristallisieren erübrigt.After the reaction has taken place, the reaction mixture can be worked up in a conventional manner, e.g. by filtering off the ammonium salt formed and separating the solvent. The remaining solid products are generally so pure that a subsequent recrystallization is unnecessary.
Gemäß dem erfindungsgemäßen Verfahren können letztlich ausgehend von primären Aminen, deren Substituenten breit variierbar sind, auf einfachem Wege und in hohen Ausbeuten Iminokohlensäurediarylester gewonnen werden, deren Aryloxyreste praktisch beliebig substituiert sein können.According to the process of the invention, starting from primary amines, the substituents of which can be varied widely, it is possible to obtain diaryl esters of iminocarbonic acid in a simple manner and in high yields, the aryloxy radicals of which can be substituted in virtually any manner.
Für die Weiterverwendung besonders interessante Verbindungen sind Iminokohlensäurediphenylester der Formel II,
Tertiäre Alkylreste sind z.B. solche mit 4 bis 10, insbesondere 4 bis 8 Kohlenstoffatomen, wie tert.-Butyl oder tert.-Pentyl. Aminoalkylgruppen sind solche der oben definierten Struktur
-NH--R⁴ ,
worin R⁴ eine C₁- bis C₄-Alkylgruppe bedeutet, wobei die Acetylgruppe bevorzugt ist. In Methyleniminogruppen -N=CR⁵₂, steht R⁵ vorzugsweise für Phenoxireste.Tertiary alkyl radicals are, for example, those having 4 to 10, in particular 4 to 8, carbon atoms, such as tert-butyl or tert-pentyl. Aminoalkyl groups are those of the structure defined above
-NH- -R⁴,
wherein R⁴ is a C₁ to C₄ alkyl group, the acetyl group being preferred. In methyleneimino groups -N = CR⁵₂, R⁵ is preferably phenoxy.
Die erfindungsgemäßen Verbindungen sind wie eingangs erwähnt wichtige Zwischenprodukte, insbesondere können sie z.B. wie in Chem. Ber. 117, Seite 2579, 1984, Journal of Heterocyclic Chemistry 21, 753-757, 1984 oder in US-PS 4 285 878 beschrieben zu Isoharnstoffen weiterverarbeitet werden.As mentioned at the outset, the compounds according to the invention are important intermediates; 117, page 2579, 1984, Journal of Heterocyclic Chemistry 21 , 753-757, 1984 or described in US Pat. No. 4,285,878 to form isoureas.
Das erfindungsgemäße Verfahren sei an folgenden Beispielen erläutert:The process according to the invention is illustrated by the following examples:
17,5 g (50 mmol) N-(2,5-dimethoxy-phenyl)-iminokohlensäurediphenylester wurden mit 25,7 g (200 mmol) 4-Chlorphenol durchmischt und unter Rühren und Anlegen eines schwachen Vakuums (Wasserstrahlpumpe) auf 150°C erhitzt. Nach 2 Stunden wurde alles überschüssige Phenol abdestilliert und man erhielt 19,3 g (92%) N-(2,5-dimethoxy-phenyl)iminokohlensäure-di-(4-chlorphenyl)-ester.
Elementaranalyse:
berechnet:
C 60,3 H 4,1 N 3,3 Cl 16,9
gefunden:
C 60,6 H 4.3 N 3,3 Cl 16,717.5 g (50 mmol) of N- (2,5-dimethoxy-phenyl) -iminocarbonic acid diphenyl ester were mixed with 25.7 g (200 mmol) of 4-chlorophenol and with stirring and applying a slight vacuum (water jet pump) to 150 ° C. heated. After 2 hours, all excess phenol was distilled off and 19.3 g (92%) of N- (2,5-dimethoxy-phenyl) iminocarbonic acid di- (4-chlorophenyl) ester were obtained.
Elemental analysis:
calculated:
C 60.3 H 4.1 N 3.3 Cl 16.9
found:
C 60.6 H 4.3 N 3.3 Cl 16.7
Analog wurden die in Tabelle 1 aufgeführten Verbindungen der Formel I
8,07 g (30 mmol) Dichlordiphenoxymethan wurden mit 6,66 g (66 mmol) Triethylamin in 200 ml THF gelöst. Nach Zugabe einer Spatelspitze Dimethylaminopyridin wurden 3,83 g (30 mmol) 4-Chloranilin, gelöst in 20 ml THF, langsam zugetropft. Man ließ 24 Stunden rühren und filtrierte das Ammoniumsalz ab. Nach Entfernen des Lösungsmittels wurden 9,6 g (99%) N-(4-Chlorphenyl)-iminokohlensäurediphenylester vom Smp. 96°C erhalten.8.07 g (30 mmol) of dichlorodiphenoxymethane were dissolved in 6.6 ml (66 mmol) of triethylamine in 200 ml of THF. After adding a spatula tip of dimethylaminopyridine, 3.83 g (30 mmol) of 4-chloroaniline, dissolved in 20 ml of THF, were slowly added dropwise. The mixture was stirred for 24 hours and the ammonium salt was filtered off. After removal of the solvent, 9.6 g (99%) of N- (4-chlorophenyl) -iminocarbonic acid diphenyl ester of mp. 96 ° C. were obtained.
Analog wurden die in Tabelle 2 aufgeführten Verbindungen der Formel
Claims (10)
R¹ eine Alkyl-, Aminoalkyl-, Cycloalkyl-, Aralkyl-, Arylgruppe oder einen heterocyclischen oder heteroaromatischen Rest darstellt,
Y und Z gleich oder verschieden sind und eine Alkyl-, Alkoxy-, Halogenalkyl-, Aryl-, Cyano-, Nitrogruppe oder Halogen bedeuten,
m und n für eine ganze Zahl von 1 bis 5 stehen, wobei, wenn m und n größer 1 sind, die Reste Y bzw. Z gleich oder verschieden sind,
dadurch gekennzeichnet, daß man Iminokohlensäurediphenylester II
R¹ represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical,
Y and Z are the same or different and represent an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen,
m and n represent an integer from 1 to 5, where, if m and n are greater than 1, the radicals Y and Z are identical or different,
characterized in that diphenyl imino carbonate II
R¹ eine Alkyl-, Aminoalkyl-, Cycloalkyl-, Aralkyl-, Arylgruppe oder einen heterocyclischen oder heteroaromatischen Rest darstellt,
Z eine Alkyl-, Alkoxy-, Halogenalkyl-, Aryl-, Cyano-, Nitrogruppe oder Halogen bedeutet und
n für eine ganze Zahl von 1 bis 5 steht, dadurch gekennzeichnet, daß man Iminokohlensäurediphenylester II
R¹ represents an alkyl, aminoalkyl, cycloalkyl, aralkyl, aryl group or a heterocyclic or heteroaromatic radical,
Z represents an alkyl, alkoxy, haloalkyl, aryl, cyano, nitro group or halogen and
n stands for an integer from 1 to 5, characterized in that diphenyl imino carbonate II
R¹ die in Anspruch 9 genannte Bedeutung hat,
Z für Halogen, C₁-C₄-Alkyl, C₁-C₄-Alkoxy oder Phenyl steht und
n die Zahl 1 oder 2 darstellt.10. Imino carbonic acid diaryl ester of the formula V
R¹ has the meaning given in claim 9,
Z represents halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy or phenyl and
n represents the number 1 or 2.
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DE3719015 | 1987-06-06 | ||
DE19873719015 DE3719015A1 (en) | 1987-06-06 | 1987-06-06 | METHOD FOR PRODUCING IMINOCOLOUREDEDIARYL ESTERS |
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EP0294686A2 true EP0294686A2 (en) | 1988-12-14 |
EP0294686A3 EP0294686A3 (en) | 1990-03-21 |
EP0294686B1 EP0294686B1 (en) | 1992-12-09 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2103010A5 (en) * | 1970-07-04 | 1972-04-07 | Viehe H G | |
FR2564833A1 (en) * | 1984-05-23 | 1985-11-29 | Egyt Gyogyszervegyeszeti Gyar | PROCESS FOR THE PREPARATION OF IMIDAZOLIDINE DERIVATIVES |
JPH059846B2 (en) * | 1981-09-28 | 1993-02-08 | Fuji Photo Film Co Ltd |
-
1987
- 1987-06-06 DE DE19873719015 patent/DE3719015A1/en not_active Withdrawn
-
1988
- 1988-05-31 DE DE8888108662T patent/DE3876502D1/en not_active Expired - Fee Related
- 1988-05-31 EP EP88108662A patent/EP0294686B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2103010A5 (en) * | 1970-07-04 | 1972-04-07 | Viehe H G | |
JPH059846B2 (en) * | 1981-09-28 | 1993-02-08 | Fuji Photo Film Co Ltd | |
FR2564833A1 (en) * | 1984-05-23 | 1985-11-29 | Egyt Gyogyszervegyeszeti Gyar | PROCESS FOR THE PREPARATION OF IMIDAZOLIDINE DERIVATIVES |
Non-Patent Citations (1)
Title |
---|
HOUBEN-WEYL: "Methoden der Organischen Chemie", Band E4, 1983, Seiten 561-569, Georg Thieme Verlag, Stuttgart, DE * |
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EP0294686A3 (en) | 1990-03-21 |
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